ICALEPCS2023 - List of Authors (Washington, R.A.)

Paper	Title	Page
THMBCMO23	Development of a New Timing System for ISIS	1247
	R.A. Washington STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	The timing system at the ISIS Neutron and Muon source has been operating in its current iteration since 2008. Machine timing is handled by the Central Timing Distributor (CTD) which transmits various timing signals to ISIS accelerator equipment over RS-422 compliant timing buses. The nature of these timing signals has not changed since ISIS first delivered neutrons in 1984, and this paper will look at how an event-based timing system can be employed in the next generation of timing system for ISIS. A new timing system should allow for the distribution of events, triggers and timestamps, provide an increase in timing resolution and be fully backwards compatible with the current timing frame. The new Digitised Waveform System (DWS) at ISIS supports White Rabbit (WR). There is an available WR network which can be used to investigate a new timing system based on WR technology. Conclusions will be drawn from installing this new system in parallel with the current timing system; a comparison between the systems, alternatives, and next steps will be discussed.
	Slides THMBCMO23 [0.798 MB]
DOI •	reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-THMBCMO23
About •	Received ※ 05 October 2023 — Revised ※ 10 October 2023 — Accepted ※ 13 December 2023 — Issued ※ 17 December 2023
Cite •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPDP075	Full Scale System Test of Prototype Digitised Waveform System at ISIS
	K. Koh, R.A. Washington STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
	A digitised waveform system (DWS) is in development at the ISIS Neutron and Muon source to replace the existing Analogue Waveform Switching (AWS) system used for monitoring signals from distributed equipment. While the existing system multiplexes analogue signals into oscilloscopes, the proposed DWS will digitise the signals near their source for display with a PyQt based application. A proof-of-concept was previously commissioned with 48 channels and demonstrated the system’s feasibility. Further work has since been undertaken to scale the system up to the full capacity of 480 signals. In the full test system, acquisitions are timestamped using precise timing provided by a White Rabbit network. Additionally, a configuration service for the system was implemented. The scaled-up test system is compared with the existing AWS. Whilst it is primarily designed as a replacement for the AWS, the modular architecture makes it flexible enough to fulfil different potential purposes and work with different technologies. This last point is discussed with respect to other proposed upgrades for the ISIS accelerator controls system.
	Poster THPDP075 [0.845 MB]
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Paper

Title

Page

Development of a New Timing System for ISIS

1247

R.A. Washington
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

The timing system at the ISIS Neutron and Muon source has been operating in its current iteration since 2008. Machine timing is handled by the Central Timing Distributor (CTD) which transmits various timing signals to ISIS accelerator equipment over RS-422 compliant timing buses. The nature of these timing signals has not changed since ISIS first delivered neutrons in 1984, and this paper will look at how an event-based timing system can be employed in the next generation of timing system for ISIS. A new timing system should allow for the distribution of events, triggers and timestamps, provide an increase in timing resolution and be fully backwards compatible with the current timing frame. The new Digitised Waveform System (DWS) at ISIS supports White Rabbit (WR). There is an available WR network which can be used to investigate a new timing system based on WR technology. Conclusions will be drawn from installing this new system in parallel with the current timing system; a comparison between the systems, alternatives, and next steps will be discussed.

Slides THMBCMO23 [0.798 MB]

DOI •

reference for this paper ※ doi:10.18429/JACoW-ICALEPCS2023-THMBCMO23

About •

Received ※ 05 October 2023 — Revised ※ 10 October 2023 — Accepted ※ 13 December 2023 — Issued ※ 17 December 2023

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPDP075

Full Scale System Test of Prototype Digitised Waveform System at ISIS

K. Koh, R.A. Washington
STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom

A digitised waveform system (DWS) is in development at the ISIS Neutron and Muon source to replace the existing Analogue Waveform Switching (AWS) system used for monitoring signals from distributed equipment. While the existing system multiplexes analogue signals into oscilloscopes, the proposed DWS will digitise the signals near their source for display with a PyQt based application. A proof-of-concept was previously commissioned with 48 channels and demonstrated the system’s feasibility. Further work has since been undertaken to scale the system up to the full capacity of 480 signals. In the full test system, acquisitions are timestamped using precise timing provided by a White Rabbit network. Additionally, a configuration service for the system was implemented. The scaled-up test system is compared with the existing AWS. Whilst it is primarily designed as a replacement for the AWS, the modular architecture makes it flexible enough to fulfil different potential purposes and work with different technologies. This last point is discussed with respect to other proposed upgrades for the ISIS accelerator controls system.

Poster THPDP075 [0.845 MB]

Cite •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)